This is a pin insulator that was once used to insulate the wires in telegraph poles.
Impurities in the glass from which these insulators were made resulted in a vast array of colours, making these very collectible today.
Which of these statements about the glass in these insulators is true?
I) It cannot accept any transfer of electrons onto it
II) It does not allow its electrons to move easily
III) It tends to securely hold onto its electrons
IV) It tends to block the movement of electrons through it
V) It allows electrons to change positions within it